Preheat a 14 to 16-inch pizza stone in an oven at 500 degrees.
Rub the olive oil over the pizza crust. Smash half of the blackberries and spread out over the crust.
Top oiled crust with mozzarella and parmesan cheese.
Scatter remaining blackberries over the pizza. Place spoonfuls of ricotta randomly over the pizza.
Bake on the pizza stone for 10 to 15 minutes, until cheese starts to brown. Scatter basil leaves over the pizza during the last few minutes of baking.
Remove from oven and slice into 8 large slices.
